`tex-insert-quote' after single `'' opens quotes instead of closing

Without this, it's very hard to precede double quotes with the
apostrophe character, i.e. insert the sequence '``
(quote-backquote-backquote), commonly useful in portuguese, for
instance.

* tex-mode.el (tex-insert-quote): Add ?' to the list of preceding
chars making `tex-insert-quote' be in the "opening" context.

1 files changed, 5 insertions, 1 deletions

diff --git a/lisp/textmodes/tex-mode.el b/lisp/textmodes/tex-mode.el
index c26c6098364..274cb4aa434 100644
--- a/lisp/textmodes/tex-mode.el
+++ b/lisp/textmodes/tex-mode.el
@@ -1331,7 +1331,9 @@ inserts \" characters."
           (goto-char saved)
           (insert (if (> saved (mark)) tex-close-quote tex-open-quote)))
       (if (or (memq (char-syntax (preceding-char)) '(?\( ?> ?\s))
-              (memq (preceding-char) '(?~)))
+              (memq (preceding-char) '(?~ ?')))
+          ;; We're in an "opening" context
+          ;;
           (if electric-pair-mode
               (if (looking-at (regexp-quote tex-close-quote))
                   (forward-char (length tex-close-quote))
@@ -1339,6 +1341,8 @@ inserts \" characters."
                 (insert tex-close-quote)
                 (backward-char (length tex-close-quote)))
             (insert tex-open-quote))
+        ;; We're in a "closing" context.
+        ;;
         (if (looking-at (regexp-quote tex-close-quote))
             (forward-char (length tex-close-quote))
           (insert tex-close-quote))))))